TypeScript Version: 1.8/Playground

Code

interface A {
    a: boolean;
}
interface B {
    b: boolean;
}

declare const fooAB: (() => A) & (() => B);
const ab = fooAB(); // A

Expected behavior: ab has type A & B

Actual behavior: ab has type A

Perhaps this is being treated as an overloaded call signature, and () => A just happens to be first. If this is by design, it would be great to learn about any known workarounds.

cc @kevinder